Thulium-164
Properties and data of the isotope 164Tm.
See also: list of Thulium isotopes.
General data
Name of the isotope:Thulium-164; Tm-164Symbol:164Tm or 16469TmMass number A:164 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:95Isotopic mass:163.933543(26) u (atomic weight of Thulium-164)Nuclide mass:163.8956944 u (calculated nuclear mass without electrons)Mass excess:-61.9043 MeVMass defect:1.429551228 u (per nucleus)Nuclear binding energy:1331.61839157 MeV (per nucleus)
8.11962434 MeV (average binding energy per nucleon)Separation energy:SN = 7.247(25) MeV (first neutron)
SP = 4.025(25) MeV (first proton)Half-life:1.95(10) minDecay constant λ:0.0059243348765807 s-1Specific activity α:2.188783995595 × 10+19 Bq g-1
591563242.05281 Ci g-1Spin and parity:
(nuclear angular momentum)1+Magnetic dipole moment:μ(μN) = + 2.38(3)Quadrupole moment Q:0.71(5) barn (100 fm2)Nuclear g-factor:gl = 2.38Charge radius:5.1906(42) femtometer fmYear of discovery:1960
Radioactive Decay
Half-life T½ = 1.95(10) min (minutes) respectively 1.17 × 102 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 164Er | 100 % | 4.039(24) MeV | |
Parent Nuclides
Direct parent isotope is: 164Yb.
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 164mTm | +x keV | 5.1(1) min | 6- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 95) and isobaric (same nucleon number A = 164) with Thulium-164. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 95 | Isobar A = 164 |
|---|
| 55 | 150Cs | |
| 56 | 151Ba | |
| 57 | 152La | |
| 58 | 153Ce | |
| 59 | 154Pr | |
| 60 | 155Nd | |
| 61 | 156Pm | |
| 62 | 157Sm | 164Sm |
| 63 | 158Eu | 164Eu |
| 64 | 159Gd | 164Gd |
| 65 | 160Tb | 164Tb |
| 66 | 161Dy | 164Dy |
| 67 | 162Ho | 164Ho |
| 68 | 163Er | 164Er |
| 69 | 164Tm | 164Tm |
| 70 | 165Yb | 164Yb |
| 71 | 166Lu | 164Lu |
| 72 | 167Hf | 164Hf |
| 73 | 168Ta | 164Ta |
| 74 | 169W | 164W |
| 75 | 170Re | 164Re |
| 76 | 171Os | 164Os |
| 77 | 172Ir | 164Ir |
| 78 | 173Pt | |
| 79 | 174Au | |
| 80 | 175Hg | |
| 81 | 176Tl | |
External data and identifiers
Last update: 2020-10-11
Perma link: https://www.chemlin.org/isotope/thulium-164
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